Die for forming axes



DIE FOR FORM 111111111 c.

Patented J 1111111111 N. PrrRs. vmwmha n w, warn mmmm a UNITED ST TESPATENT OFFICEQ JOHN W. 'BOWERS, OF FRANKLIN, ASSIGNOR TO THE DOUGLAS AXEMANU- FAOTUBING COMPANY, OF BOSTON, MASSACHUSETTS.

DIE FOR FORMINGIAXES, 80C.

s ecific-Arron forming part of Letters Patent No. 367,131, dated July26, 1887. Application filed February 23, 1887. Serial No.228A61. (Nomodel.)

10 and similar wedge-shaped tools, not only upon the sides,butparticularly upon the head; and it consists in having the matrix-spacein the lower or anvil die contained below a horizontal plane coincidentwith the striking-surface of that die at the bit end equal to the entirefinished tool, and the working-face of the upper die when fixedinthemachine substantially in a plane parallel with said horizontal plane,while the head-forming face of the lower 2 die is in a plane at rightangles to a plane which will bisect the matrix-space laterally.Heretofore dies used for this purpose have been constructed in suchmanner that a horizontal plane passing laterally through the ex- 2 tremeend of the bit or cutting-edge of the tool as it laid in proper positionin the lower or anvil die would divide the tool into equal parts, andthe upper surface of the tool would have an inclination equal to theangle made 0 by the-plane of such upper surface with said horizontalplane, and the working-face of the upper die'niust consequently have thesame inclination. This construction tends to throw the upper die in thedirection of the bit end 3 5 of the tool every time that that die isforced upon the blank in the anvil-die, which will soon loosen the upperdie from its fastenings or cause undue strain upon the machinery.

Myimproved construction of dies obviates 40 these diiiieulties, and atthe same time gives a much better finish to the head of the tool bypressing it with greater force against the headforming wall of thematrix. I

The drawing forming a part of this specification represents a verticalsection of the dies through the middle of the matrix from the head tothe bit end, the particular matrix shown being such as will produce anax; but it will be readily understood that a modification of thespecific form of the working-faces of the dies will produce articles ofdifferent external contour, but all within the class of wedge-shapedtools.

As will be seen by reference to the drawing, I make the matrix in thelower or anvil die, A, sufficiently deep and in such form as tobring'the upper surface of the tool when placed therein substantially ina horizontal plane passing through the extreme bit end e of thematrix-space or tool; or, more strictly speaking, substantially in ahorizontal plane coincident with the striking-surface fof the lower diebeyond the bit-forming end of the matrix; and I also make theworking-face g of the upper die, B, in a plane, as nearly as its curvedsurface will admit, which is subof the striking-surfacef of the lowerdie. The

' wall h of the lower die, A,which is to form the head of the tool, Iform in a plane at right angles to a plane, 1', (shown in dotted line,)

which divides the matrix-space into equal parts laterally.

When the upper die is brought into contact with the blank resting in thelower die, the lower inclined face of the matrix therein will cause theblank to be forced toward the headforining wall h, and thus the head ofthe tool will be swaged into a smooth and perfect surface, and the edgesand corners of the head will be squared up and brought into perfectshapeat the same time that the sides or checks of the tool are giventheir finished form; and it will also be readily seen that theworking-face g of the upper die being substantially. in a horizontalplane when striking the upper side of the blank,which occupiessubstantially a similar plane,will not be subjected to any undue lateralstrain, as in the case of dies of prior construction, where two inclinedsurfaces are brought violently together.

In the construction of thelower die the projecting portion, whichconstitutes the head forming wall h, should be made higher than thethickness of the head of any tool which-is to be formed therein, inorder that when the upper die descends the head end of its workingfacemay pass below the upper surface of this projecting portion of the lowerdie and prevent the possibility of crowding the metal of the blank overupon it.

A slight variation of the plane of the working-face of the upper diefrom ahorizontal position will not materially affect the beneficialoperation of the dies; but by as much as the angle of-inelinationbetween the plane of the \vorkingfiiee of the upper die and a horizontalplane decreases,by so much will the benefits incident to my improvedconstruction be derived.

I elaim The improvement in dies for forming axes and similar\vedgeshaped tools, hereinabove described, in which the working-face ofthe upper die is formed substantially in a plane which is horizontalwhen the die is in proper position in the machine where it is tooperate, and the matrix-space equal to the entire finished tool iscontained in the lower die below a horizontal plane coincident with thestriking-surface of the die at the bit end, the headforming wall of thelower die being at right angles to a plane which will bisect thematriX-spacelaterally,substantially as shown and 25

